PREPARATION OF P-NITROSOPHENOL

OBSERVATION AND CALCULATIONS:-

Molecular weight of Phenol = 94.0g

Molecular weight of P-nitrosophenol = 123.0g

94.0g of phenol yields P-nitrosophenol = 123.0g

1.0g of phenol yields P-nitrosophenol = 123/90g

6.0g of phenol yields P-nitrosophenol = 123/90 ´ 6

= 7.85g

Theoretical yield = 7.85g

Practical yield = 6.40g

Percentage yield = Practical yield/Theoretical yield ´ 100

= 6.40/7.85 ´ 100

= 81.5%

RESULT:- Percentage yield of P-nitrosophenol is 81.5%.

APPARATUS:- Round bottom flask, Burner, Stand, Beaker, Funnel, Condenser, Water bath, stirrer etc.

CHEMICALS:-

Phenol

Sodium Nitrite

Sulfuric acid

Sodium Hydroxide

PROCEDURE:-

1. Dissolved 15.0g of concentrated sulfuric acid in 10.0 ml of water (solution No. 1).
2. Dissolved 2.7g of NaOH in 150.0ml of water (solution No. 2).
3. 6g of phenol and 5.4g of NaNO₂ were mixed (solution No. 3).
4. Solution No. 3 was added into Solution No. 2 then that mixture was dissolved in solution No. 1.
5. A big china dish was filled with crushed ice and the reaction mixture was transferred to the ice bath, and was kept for 1 hour and 45 minutes without stirring.
6. Precipitates of p-Nitrosophenol were obtained.
7. Filtration was done and the precipitates were collected.
8. Precipitates were weighed and percentage yield was calculated.